Conducting cation radical salts based on a pyrazine-fused iodine-bonded Ï-donor diiodo(pyrazino)tetraselenafulvalene (DIPSe) and octahedral anions AF6 (A = P, As, Sb) have been prepared by electrochemical oxidation. X-Ray structure analysis revealed that these three salts are isostructural and crystallize in the hexagonal P63/mcm space group. There is a strong and directional Iâ¯N iodine bond among the donor molecules, which is 18â19% shorter than the sum of the van der Waals radii. The hexagonal lattice is filled with the equilateral triangles of the donor molecules tailored by the Iâ¯N iodine bond and there are also two types of supramolecular channels including the counter anion and the crystalline solvent. The room temperature resistivities of these three salts are in the order of 10â2
 				Ω cm with metallic behaviour and they show a gentle upturn at around 250 K. In addition to the high-symmetrical crystal structure and the metallic conductivity, high yield recovery of the neutral Ï-donor from the cation radical salts has been accomplished by a simple chemical reaction. In situ1H-NMR monitoring of the reaction process indicates that the DIPSe cation radical was reduced by water and the characteristic supramolecular channels, which allow water molecules to access the cation radicals deep in the crystal, are essential for smooth progress of the recovery process.
                                    基于
吡嗪-融合
碘键的Β-供体二
碘(
吡嗪)四
硒烯富瓦烯(
DIPSe)和八面体阴离子AF6(A = P、As、Sb)的阳离子自由基盐通过电
化学氧化制备而成。X射线结构分析显示,这三种盐具有相同的结构,并以六方P63/mcm空间群结晶。供体分子之间存在强定向I➔N
碘键,其长度比范德华半径之和短18-19%。六方晶格中充满了由I➔N
碘键形成的供体分子的等边三角形,还有两种超分子通道,包括反离子和结晶溶剂。这三种盐的室温电阻率约为10⁻² Å·cm,具有
金属特性,并在250 K左右出现温和上升。除了高对称晶体结构和
金属导电性外,通过简单的
化学反应,还可以从阳离子自由基盐中回收大量中性Β-供体。反应过程的原位1H-NMR监测表明,
DIPSe阳离子自由基被
水还原,而允许
水分子进入晶体深处的阳离子自由基的典型超分子通道对于回收过程的顺利进行至关重要。